Uniqueness of improper operations
Universal algebras with all operations of bounded range
Universal and internal properties of some extensions of partially orderd sets.
Universal cyclic relations
Universal cyclically ordered sets
Univerzální algebry
Unsolid and fluid strong varieties of partial algebras.
Upper and Lower Bounds in Relator Spaces
2000 Mathematics Subject Classification: 06A06, 54E15An ordered pair X(R) = ( X, R ) consisting of a nonvoid set X and a nonvoid family R of binary relations on X is called a relator space. Relator spaces are straightforward generalizations not only of uniform spaces, but also of ordered sets. Therefore, in a relator space we can naturally define not only some topological notions, but also some order theoretic ones. It turns out that these two, apparently quite different, types of notions are closely...
Upper semicomplements and a definable element in the lattice of groupoid varieties
Užití zobecněné věty Jordan-Hölderovy v teorii direktních součinů množin s operátory